{"action":"created","issue":{"url":"https://api.github.com/repos/HIPS/autograd/issues/319","repository_url":"https://api.github.com/repos/HIPS/autograd","labels_url":"https://api.github.com/repos/HIPS/autograd/issues/319/labels{/name}","comments_url":"https://api.github.com/repos/HIPS/autograd/issues/319/comments","events_url":"https://api.github.com/repos/HIPS/autograd/issues/319/events","html_url":"https://github.com/HIPS/autograd/pull/319","id":267319019,"number":319,"title":"Changed the tanh derivative from g/cosh(x)**2 to g*(1-tanh(x)**2) ","user":{"login":"RmStorm","id":13096654,"avatar_url":"https://avatars3.githubusercontent.com/u/13096654?v=4","gravatar_id":"","url":"https://api.github.com/users/RmStorm","html_url":"https://github.com/RmStorm","followers_url":"https://api.github.com/users/RmStorm/followers","following_url":"https://api.github.com/users/RmStorm/following{/other_user}","gists_url":"https://api.github.com/users/RmStorm/gists{/gist_id}","starred_url":"https://api.github.com/users/RmStorm/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/RmStorm/subscriptions","organizations_url":"https://api.github.com/users/RmStorm/orgs","repos_url":"https://api.github.com/users/RmStorm/repos","events_url":"https://api.github.com/users/RmStorm/events{/privacy}","received_events_url":"https://api.github.com/users/RmStorm/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2017-10-20T22:15:25Z","updated_at":"2017-10-21T08:31:05Z","closed_at":null,"author_association":"CONTRIBUTOR","pull_request":{"url":"https://api.github.com/repos/HIPS/autograd/pulls/319","html_url":"https://github.com/HIPS/autograd/pull/319","diff_url":"https://github.com/HIPS/autograd/pull/319.diff","patch_url":"https://github.com/HIPS/autograd/pull/319.patch"},"body":"This way ans can be reused as in g*(1-ans**2) which should be a little quicker since it omits the cosh call. But mainly I get overflow warnings because of the use of cosh. This new quicker derivative solves that."},"comment":{"url":"https://api.github.com/repos/HIPS/autograd/issues/comments/338375337","html_url":"https://github.com/HIPS/autograd/pull/319#issuecomment-338375337","issue_url":"https://api.github.com/repos/HIPS/autograd/issues/319","id":338375337,"user":{"login":"j-towns","id":15261883,"avatar_url":"https://avatars2.githubusercontent.com/u/15261883?v=4","gravatar_id":"","url":"https://api.github.com/users/j-towns","html_url":"https://github.com/j-towns","followers_url":"https://api.github.com/users/j-towns/followers","following_url":"https://api.github.com/users/j-towns/following{/other_user}","gists_url":"https://api.github.com/users/j-towns/gists{/gist_id}","starred_url":"https://api.github.com/users/j-towns/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/j-towns/subscriptions","organizations_url":"https://api.github.com/users/j-towns/orgs","repos_url":"https://api.github.com/users/j-towns/repos","events_url":"https://api.github.com/users/j-towns/events{/privacy}","received_events_url":"https://api.github.com/users/j-towns/received_events","type":"User","site_admin":false},"created_at":"2017-10-21T08:31:05Z","updated_at":"2017-10-21T08:31:05Z","author_association":"CONTRIBUTOR","body":"👍 I found this quite a lot quicker and hav included it in #312, but that probably won't be merged into master very soon so this pr is good in the mean time. You can do something similar for the derivative of `tan` and of `sinh`."}}
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